Pengaruh rake angle terhadap kekasaran permukaan pada material st40 menggunakan pahat hss dengan metode taguchi dalam proses turning pada Mesin bubut konvensional

This study aims to investigate the effect of rake angle variation on the surface roughness during the turning process of ST-40 steel material using a High-Speed Steel (HSS) cutting tool. The parameters varied in this research include rake angle (5°, 10°, and 15°), spindle rotation speed (190 rpm, 300 rpm, and 460 rpm), and depth of cut (0.5 mm, 1 mm, and 1.5 mm). The study employed the Taguchi method with an L9(3^3) orthogonal array experimental design. Surface roughness data were obtained through measurements using a Surface Roughness Tester, and the analysis was conducted using the Signal to Noise Ratio (Smaller is Better) and ANOVA to determine the significant influence of each parameter. Based on the results of this study, the lowest surface roughness value was found in the sixth parameter setting, with a rake angle of 10°, spindle speed of 460 rpm, and a depth of cut of 0.5 mm, producing a surface roughness of 3.997083 μm. The highest surface roughness occurred in the first parameter setting, with a rake angle of 5°, spindle speed of 190 rpm, and a depth of cut of 0.5 mm, resulting in an average surface roughness of 5.811917 μm.